|
|
|
|
@ -10,7 +10,7 @@ |
|
|
|
|
alink="#0000ff"> |
|
|
|
|
<H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1> |
|
|
|
|
|
|
|
|
|
<P>Last updated: Mon Jan 31 17:58:50 EST 2005</P> |
|
|
|
|
<P>Last updated: Mon Jan 31 19:18:44 EST 2005</P> |
|
|
|
|
|
|
|
|
|
<P>Current maintainer: Bruce Momjian (<A href= |
|
|
|
|
"mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</A>) |
|
|
|
|
@ -568,27 +568,11 @@ |
|
|
|
|
<H4><A name="3.5">3.5</A>) Why do I get <I>"Sorry, too many |
|
|
|
|
clients"</I> when trying to connect?</H4> |
|
|
|
|
|
|
|
|
|
<P>You need to increase <I>postmaster</I>'s limit on how many |
|
|
|
|
concurrent backend processes it can start.</P> |
|
|
|
|
|
|
|
|
|
<P>The default limit is 32 processes. You can increase it by |
|
|
|
|
restarting <I>postmaster</I> with a suitable <I>-N</I> value or |
|
|
|
|
modifying <I>postgresql.conf</I>.</P> |
|
|
|
|
|
|
|
|
|
<P>Note that if you make <I>-N</I> larger than 32, you must also |
|
|
|
|
increase <I>-B</I> beyond its default of 64; <I>-B</I> must be at |
|
|
|
|
least twice <I>-N</I>, and probably should be more than that for |
|
|
|
|
best performance. For large numbers of backend processes, you are |
|
|
|
|
also likely to find that you need to increase various Unix kernel |
|
|
|
|
configuration parameters. Things to check include the maximum size |
|
|
|
|
of shared memory blocks, <SMALL>SHMMAX;</SMALL> the maximum number |
|
|
|
|
of semaphores, <SMALL>SEMMNS</SMALL> and <SMALL>SEMMNI;</SMALL> the |
|
|
|
|
maximum number of processes, <SMALL>NPROC;</SMALL> the maximum |
|
|
|
|
number of processes per user, <SMALL>MAXUPRC;</SMALL> and the |
|
|
|
|
maximum number of open files, <SMALL>NFILE</SMALL> and |
|
|
|
|
<SMALL>NINODE</SMALL>. The reason that PostgreSQL has a limit on |
|
|
|
|
the number of allowed backend processes is so your system won't run |
|
|
|
|
out of resources.</P> |
|
|
|
|
You have reached the default limit is 100 database sessions. You |
|
|
|
|
need to increase the <I>postmaster</I>'s limit on how many |
|
|
|
|
concurrent backend processes it can start by changing the |
|
|
|
|
<I>max_connections</I> value in <I>postgresql.conf</I> and |
|
|
|
|
restarting the <I>postmaster</I>.</P> |
|
|
|
|
|
|
|
|
|
<H4><A name="3.6">3.6</A>) What is in the <I>pgsql_tmp</I> directory?</H4> |
|
|
|
|
|
|
|
|
|
|